Diet of the Great Cormorant (<i>Phalacrocorax carbo Sinensis</i>) at the Juodkrantė Colony, Lithuania

Pūtys, Žilvinas; Zarankaitė, Jūratė

doi:10.2478/v10043-010-0031-6

Cited by 18 publications

(18 citation statements)

References 11 publications

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“…Benthivorous birds, feeding on macrofauna, produce an effect on the benthic system similar to that of fishes, removing animals that may keep the sediment oxidized and resuspending sediments and nutrients (Werner et al, 2005;Sánchez et al, 2006;Rodríguez-Pérez et al, 2007;Matuszak et al, 2014). Piscivorous birds convert fish-associated P into reactive P (Putys and Zarankaitė, 2010). Large colonies of cormorants have their peak activity during summer.…”

Section: Birdsmentioning

confidence: 99%

Drivers of Cyanobacterial Blooms in a Hypertrophic Lagoon

et al. 2018

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The Curonian Lagoon is Europe's largest lagoon and one of the most seriously impacted by harmful blooms of cyanobacteria. Intensive studies over the past 20 years have allowed us to identify the major drivers determining the composition and spatial extent of hyperblooms in this system. We summarize and discuss the main outcomes of these studies and provide an updated, conceptual scheme of the multiple interactions between climatic and hydrologic factors, and their influence on internal and external processes that promote cyanobacterial blooms. Retrospective analysis of remote sensed images demonstrated the variability of blooms in terms of timing, extension and intensity, suggesting that they occur only under specific circumstances. Monthly analysis of nutrient loads and stoichiometry from the principal tributary (Nemunas River) revealed large interannual differences in the delivery of key elements, but summer months were always characterized by a strong dissolved inorganic N (and Si) limitation, that depresses diatoms and favors the dominance of cyanobacteria. Cyanobacteria blooms occurred during high water temperatures, long water residence time and low-wind conditions. The blooms induce transient (night-time) hypoxia, which stimulates the release of iron-bound P, producing a positive feedback for blooms of N-fixing cyanobacteria. Consumermediated nutrient recycling by dreissenid mussels, chironomid larvae, cyprinids and large bird colonies, may also affect P availability, but their role as drivers of cyanobacteria blooms is understudied.

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Section: Birdsmentioning

confidence: 99%

Drivers of Cyanobacterial Blooms in a Hypertrophic Lagoon

et al. 2018

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“…In an investigation of cormorant diets in this area, 76% of surveyed birds were observed to have consumed European perch [24]. European perch is the fourth most abundant fish species in the Curonian Lagoon [36] and one of the most important commercial species, with annual commercial landings for the combined Lithuanian and Kaliningrad (Russia) regions of the Lagoon of 100–140 tonnes live weight (Fisheries Dept., Ministry of Agriculture, Lithuania).…”

Section: Introductionmentioning

confidence: 99%

Cormorant Catch Concerns for Fishers: Estimating the Size-Selectivity of a Piscivorous Bird

et al. 2013

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Conflict arises in fisheries worldwide when piscivorous birds target fish species of commercial value. This paper presents a method for estimating size selectivity functions for piscivores and uses it to compare predation selectivities of Great Cormorants (Phalacrocorax carbo sinensis L. 1758) with that of gill-net fishing on a European perch (Perca fluviatilis L. 1758) population in the Curonian Lagoon, Lithuania. Fishers often regard cormorants as an unwanted “satellite species”, but the degree of direct competition and overlap in size-specific selectivity between fishers and cormorants is unknown. This study showed negligible overlap in selectivity between Great Cormorants and legal-sized commercial nets. The selectivity estimation method has general application potential for use in conjunction with population dynamics models to assess fish population responses to size-selective fishing from a wide range of piscivorous predators.

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“…Annual commercial landings reported for the combined Lithuanian and Kaliningrad (Russia) zones of the lagoon ranged from 100 to 140 t live mass (Fisheries Department, Lithuania). Perca fluviatilis is also important as a food species for great cormorants Phalacrocorax carbo sinensis (Pūtys & Zarankaitė, 2010).…”

Section: Introductionmentioning

confidence: 99%

Parameterization of European perch Perca fluviatilis length-at-age data using stochastic Gompertz growth models

Troynikov

Gorfine

Ložys

et al. 2011

Journal of Fish Biology

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Three stochastic versions of the Gompertz growth model were used to parameterize total length (L(T) )-at-age data for perch Perca fluviatilis, an important target species for commercial and recreational fishers and a food species for predatory fishes and aquatic birds. Each model addresses growth heterogeneity by incorporating random parameters from a specific positive distribution: Weibull, gamma or log-normal. The modelling outputs for each version of the model provide L(T) distributions for selected ages and percentiles of L(T) at age for both males and females. The results highlight the importance of using a stochastic approach and the logistic-like growth pattern for analysing growth data for P. fluviatilis in Curonian Lagoon (Lithuania). Outputs from this modelling can be extended to a stochastic analysis of fish cohort dynamics, incorporating all length-based biological relationships, and the selectivity-related interactions between fish cohorts and fishing gear.

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Diet of the Great Cormorant (Phalacrocorax carbo Sinensis) at the Juodkrantė Colony, Lithuania

Cited by 18 publications

References 11 publications

Drivers of Cyanobacterial Blooms in a Hypertrophic Lagoon

Drivers of Cyanobacterial Blooms in a Hypertrophic Lagoon

Cormorant Catch Concerns for Fishers: Estimating the Size-Selectivity of a Piscivorous Bird

Parameterization of European perch Perca fluviatilis length-at-age data using stochastic Gompertz growth models

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